Nico Rosberg of Germany and Mercedes GP prepares to drive during practice for the Malaysia Formula One Grand Prix. (Photo: Getty Images)

Nico Rosberg set the pace in Malaysia on Friday, but the Mercedes driver admitted that keeping his tires in good shape was a major concern.

“It was a decent day,” said Rosberg. “It was very, very hot, tough for the car and tough for the tires. We never expected so much tire degradation, it’s just massive degradation out there, which is a big challenge. For sure there will be lots of different strategies. With the tires, anything can happen.”

Eli Tomac’s has finished in the top 10 three times during his rookie season. (Photo courtesy Rob Geiger)

Two familiar faces will return to the 450cc gate at St. Louis this Saturday, both riding Hondas, and both having been sidelined from the Monster Energy Supercross Series for several weeks due to injuries.

GEICO Motorcycle rider Eli Tomac has missed the last three events due to a shoulder injury, while factory Honda rider Trey Canard has been out for the first 12 rounds after breaking his arm while practicing last Thanksgiving.